Why are pedestrians comfortable to cross a single lane one-way road?

Pedestrians waiting to cross a single one-way road need only need to wait for a single vehicle to stop in order to safely cross. Pedestrians waiting to cross a multi-lane two-way road need to wait until two or more vehicles from two directions have stopped. A far more difficult task.

On this dual carrageway, the pedestrian must cross 12 metres. This is very dangerous as there may be up to four vehicles careening at 50mph (80km/h). This is enough for pedestrians to find other, safer crossing points.
A dual carriageway with a central refuge is safer than one without. The pedestrian has to pay attention to two vehicles on one direction rather than four in opposite directions. However, the best practice is to wait until both vesicles have yielded, which is unlikely as the opportunistic pedestrin will dash across the six metres compared to the 12 without a refuge.
The most common situation faced by pedestrians, a single carriageway with vehicles coming from both directions. The pedestrian has to only focus on one vehicle per directionbut can only pay attention to one at a time. Tis is easy to comprehend yet as the safest way is to wait until the drivers have stopped.
This single carrageway street has a central refuge. The pedestrian only has to focus on one vehicle, from one direction, at one time. In addition, there is now only 3 metres that has to be crossed which is a comfortable length for most people.
The single lane in an urban space is easy for pedestrian to cross. Vehicles often have reduced speed and are visible to other pedestrians making their movements steady and predictable.